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IB20 11_0610_22/3RP © UCLES 2020

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Cambridge IGCSE™

BIOLOGY 0610/22 Paper 2 Multiple Choice (Extended) October/November 2020

45 minutes You must answer on the multiple choice answer sheet. You will need: Multiple choice answer sheet Soft clean eraser Soft pencil (type B or HB is recommended)

INSTRUCTIONS There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct

and record your choice in soft pencil on the multiple choice answer sheet. Follow the instructions on the multiple choice answer sheet. Write in soft pencil. Write your name, centre number and candidate number on the multiple choice answer sheet in the

spaces provided unless this has been done for you. Do not use correction fluid. Do not write on any bar codes. You may use a calculator. INFORMATION The total mark for this paper is 40. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done on this question paper.

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1 Which process is carried out by all organisms?

A growth

B photosynthesis

C sexual reproduction

D transpiration 2 What are features of the leaves of a plant that is a dicotyledon?

broad leaves parallel veins

A key

B = yes

C = no

D

3 The photomicrograph shows a cell from a type of aquatic plant.

PQ

S

R

Which parts labelled on the photomicrograph indicate that this is a plant cell?

A P and R B P and S C Q and R D Q and S 4 The diagram shows an image of a chloroplast. The image is 5 cm long.

The actual length of the chloroplast is 5 m.

What is the magnification of the image?

A 10 B 1000 C 10 000 D 100 000

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5 What are features of osmosis?

diffusion is involved requires cell walls

requires a partiallypermeable membrane

A key

B = yes

C = no

D

6 The diagram shows apparatus which can be used to demonstrate osmosis.

glass tube

liquidlevel

water

partiallypermeable membrane

very concentratedsucrose solution

concentrated sucrose solution

1 2

After one hour, what would happen to the liquid levels in the glass tubes?

liquid level in tube 1

liquid level in tube 2

A falls falls

B falls rises

C rises falls

D rises rises 7 Which substances are made by linking together glucose molecules only?

A cellulose, glycogen and starch

B fats, cellulose and proteins

C proteins, oils and glycogen

D starch, fats and oils

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8 When bases pair up in the formation of DNA, what is one of the pairings?

A G with A B G with C C G with G D G with T 9 The graph shows the effect of pH on the rate of reaction of an enzyme.

3 4 5 6 7 8 9

rate ofreaction

pH

What does the graph show?

A The enzyme is destroyed at pH 9.

B The enzyme works best at pH 6.

C The rate of reaction halves as the pH changes from pH 5 to pH 7.

D The rate of reaction is the same at pH 5 and pH 8.5.

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10 The graph shows how enzyme activity is affected by temperature.

0 20 40 60

rate ofreaction

temperature / °C

How can the change in activity between 40 C and 55 C be explained?

A Heat has killed the enzyme.

B The enzyme has been used up.

C The reactants are moving faster.

D The substrate is less likely to fit into the active site. 11 The graph shows how the rate of photosynthesis of a plant changes with light intensity, at three

different carbon dioxide concentrations. In each case the temperature is 15 C.

0.10% carbon dioxide

0.04% carbon dioxide

0.02% carbon dioxide

light intensity

rate ofphotosynthesis

X

What is the limiting factor for the rate of photosynthesis at point X on the graph?

A carbon dioxide concentration

B light intensity

C surface area of the plant

D temperature

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12 The graph shows how the percentage of protein found in potatoes was affected by the concentration of nitrate fertiliser added to the crop when it was growing.

percentageof proteinin potatoes

concentration ofnitrate fertiliser added

These results suggest that greater concentrations of nitrate fertiliser allow the potatoes to make more

A amino acids.

B cellulose.

C lipid.

D starch. 13 Which stage of nutrition takes place when food molecules become part of a body cell?

A absorption

B assimilation

C digestion

D ingestion

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14 The diagram shows the apparatus used in an experiment to demonstrate two processes that take place in the body.

test-tube

pure water

dialysis tubing whichis partially permeable

mixture of salivaand starch solution

dialysistubingendstightlysealed

After one hour, the water outside the dialysis tubing contained reducing sugars.

Which two processes are represented by this experiment?

A absorption and digestion

B absorption and egestion

C digestion and egestion

D digestion and ingestion 15 In which order does water pass through these structures in a plant?

A mesophyll root hair xylem

B mesophyll xylem root hair

C root hair mesophyll xylem

D root hair xylem mesophyll 16 What is a function of phloem?

A transports minerals to the roots

B transports starch to the roots

C transports sugar to the roots

D transports water to the roots 17 What ensures that blood flows in one direction in the human circulatory system?

A diffusion of carbon dioxide

B diffusion of oxygen

C thick walled arteries

D valves

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18 The diagrams show four components of blood.

Which component produces antibodies?

A B C D

19 A patient was injected with antibodies after being bitten by a poisonous snake. The patient

recovered and survived.

What describes the effect in the patient’s body?

active immunity

passive immunity

memory cells produced

A key

B = yes

C = no

D 20 The diagram shows some of the structures in a human lung.

Where is the carbon dioxide concentration highest?

to pulmonary vein

from pulmonary artery

A

B

C

D

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21 What is produced during anaerobic respiration in muscles?

A carbon dioxide

B ethanol

C lactic acid

D water 22 How do the concentrations of glucose and urea in urine compare to their concentrations in blood

plasma?

glucose concentration in

urine (compared to blood plasma)

urea concentration in urine (compared to blood plasma)

A higher lower

B higher same

C same same

D lower higher 23 Which structure contains relay neurones?

A gland

B muscle

C spinal cord

D synapse 24 A man injures his arm in an accident. Afterwards, he can move his hand but cannot feel objects

touching his hand.

What could cause this?

A Both sensory and motor neurones are cut.

B Effectors are damaged.

C Motor neurones are cut.

D Sensory neurones are cut.

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25 How does the skin react when the body becomes cold?

arterioles supplying the skin surface sweat production

A constrict decreases

B dilate increases

C move towards skin surface decreases

D move away from skin surface increases 26 Which characteristic of viruses prevents them from being affected by antibiotics?

A They cannot reproduce on their own.

B They contain DNA or RNA.

C They have no cell structure.

D They are much smaller than bacteria. 27 Some flowers can only be pollinated by specific insect species.

What will happen if none of these insects are present?

A genetically different seed produced

B genetically identical seed produced

C no seed produced

D only small amounts of seed produced 28 Which hormone is used in contraceptive pills?

A insulin

B LH

C FSH

D progesterone 29 Which hormone causes the lining of the uterus to become thick and glandular before ovulation?

A adrenaline

B FSH

C oestrogen

D progesterone

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30 The diagrams show human nuclei and the number of chromosomes in each nucleus.

Which diagram represents nuclear division of skin cells for growth and repair?

46

A

2323

46

B

4646

2323

2323

C D

23

46

31 Meiosis is sometimes called ‘reduction division’.

What is reduced during meiosis?

A Body cells are reduced in size.

B Chromosomes are reduced in number.

C The number of gametes is reduced.

D The rate of cell division is reduced. 32 In guinea pigs, the allele for black fur is dominant and the allele for white fur is recessive.

A test cross can be used to determine the genotype of a black guinea pig.

What would be the expected result of the test cross if the black guinea pig was heterozygous?

A 50% black, 50% white

B 25% black, 75% white

C 100% black

D 100% white 33 What is not affected by the environment?

A height

B skin colour

C blood group

D weight

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34 Desert plants have evolved to survive in places where very little water is available.

Which process is reduced to enable them to retain as much water as possible?

A transpiration

B translocation

C respiration

D digestion 35 The diagram shows a pyramid of numbers.

level

3

2

1

What is the correct description of the trophic levels?

trophic level

1 2 3

A producers primary consumers secondary consumers

B producers secondary consumers tertiary consumers

C secondary consumers primary consumers producers

D secondary consumers tertiary consumers producers 36 Bacteria are active in the nitrogen cycle.

Which process in the nitrogen cycle is carried out by nitrifying bacteria?

A the conversion of nitrogen gas to ammonia

B the conversion of nitrogen gas to nitrates

C the conversion of ammonia to nitrates

D the conversion of nitrates to nitrogen

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37 The diagram shows a population growth curve.

500

400

300

200

100

00 10 20 30 40 50 60 70 80 90

time / days

number ofindividualsin thepopulation

How long does the population remain in the stationary phase?

A 8 days

B 12 days

C 23 days

D 48 days 38 The stages describe how genetic engineering can be used to produce human insulin from

bacteria.

1 cut bacterial plasmid DNA with restriction enzymes

2 extract gene for insulin from human DNA with restriction enzymes

3 insert recombinant plasmid into bacteria

4 join human DNA to bacterial plasmid DNA using DNA ligase

5 replicate bacteria containing recombinant plasmid

Which sequence will lead to the production of human insulin by bacteria?

A 2 1 4 3 5

B 2 5 1 3 4

C 4 2 3 1 5

D 4 3 5 1 2

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39 What is an example of sustainable use of resources?

A allowing only young fish to be caught

B cutting down a forest and not replanting trees

C controlling the number of fish caught with quotas

D planting deforested areas with one species of crop plant 40 The hormones from the female contraceptive pill can pollute water courses.

What effect do they have?

A decrease the amount of oxygen for fish

B decrease the sperm count of men

C increase the growth of producers

D increase the number of decomposers

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